In our case, RSSI = -123dBm, SNR = - 20.5dB, sensitivity = -143.5dBm, which means that the Lora radio extracts a packet from a -123dBm's envelop with 20.5dB's noise. The noise is much more larger than the actual signal -143.5dBm.]]>EUSun, 26 Nov 2017 11:33:34 +0000matchX gw & TTN - by: ttnberlinhttps://matchx.io/portal/forum/eu/22-matchx-gw-ttn#31
https://matchx.io/portal/forum/eu/22-matchx-gw-ttn#31
you asked to report us, how to connect a matchX to
www.thethingsnetwork.org
.
Yes this was possible. I arranged this successfully yesterday.

ttn berlin regional group
thethingsnetwork.org/community/berlin
]]>EUFri, 27 Oct 2017 19:57:41 +0000LoraWAN in Europe - by: adminhttps://matchx.io/portal/forum/eu/12-lorawan-in-europe#13
https://matchx.io/portal/forum/eu/12-lorawan-in-europe#13
Currently there are several channels can be used in Europe to both transmit and receive. The specific channel lists are detailed in this document ETSI EN 300 220-2 V3.1.0 : As we mentioned in our previous blog posts, the channels of our MatchX Box are listed in the following table:

Now LoraWAN protocol enforces the use of g1, and the other channels can be defined by the network operator. There are three channels in g1 for bandwidth 125kHz:

868.1MHz
868.3MHz
868.5MHz

In Europe, there is a optional field in the join response, in which the server can let the end device to know the rest of five channel frequency list. Once it is provided by the server ,the end device will update this five channel frequency list that it will use. Along with the pre-defined three channels in g1, it can use more channels to avoid collision.

It is also important to use the correct spreading factor based on the distance to avoid the collision, since the different spreading factors are orthogonal to each other. The following table listed the spreading factor and its range.

As we can see, if we use the longest range's SF, the waiting time between two sending events in a band is like 23 mins. Fortunately we can avoid long wait by using different bands together.]]>EUSat, 29 Jul 2017 15:12:43 +0000